It takes me about 5 minutes from the time I put her in park, to the time I put her in drive. I dump the black and gray at the same time. It takes the gray longer to drain anyway. I close the black valve first, I know when its empty, the splashing stops :) I rinse and store the hose, use the handy wipes(clorox)and pull away. I get out of the way to add water and chemicals to the tanks. On some occasions, I have dumped the night prior to departure when there is no lines. The next day, I just unhook the power and go. I dont worry about flushing out the tanks as I use them year round.
